CAT C15 ACERT 550HP Injectors – 10R1273

For BXS, MXS & NXS Engines

The 550HP ACERT is one of the most popular C15 platforms ever built.  

And when the injectors start slipping, you feel it immediately.

The 10R1273 is the correct OEM injector for Caterpillar C15 ACERT 550HP BXS, MXS, and NXS engines — restoring factory fueling balance, clean throttle response, and proper power under boost.

If your truck is:

• Starting to haze
• Feeling soft on the top end
• Showing contribution / balance codes
• Losing fuel economy
• Surging under load

…bust out the laptop and do some investing, but it’s likely fuel delivery.

Built for 550HP ACERT Calibrations

The 10R1273 was engineered specifically for 550 horsepower ACERT applications. Proper spray pattern. Correct fueling volume. No “close enough” substitutions.

ACERT engines are sensitive to injector quality — poor atomization equals higher EGTs, smoke, and uneven cylinder temps. These injectors restore the balance that keeps BXS, MXS, and NXS engines alive long-term.

Bolt in. Set overhead. Pull hard.

Why Momentum Worx?

We don’t move mystery-box injectors.

We support real working trucks and serious horsepower builds. When you order from us, you’re getting:

• Correct 550HP ACERT application support
• Fast shipping
• Straight answers
• No watered-down alternatives

If you're keeping a BXS/MXS/NXS alive, fuel delivery isn’t where you gamble.

OEM Cross Reference Numbers

(For search and fitment verification)

10R-1273
10R-1273R
10R1273
10R1273R
10R9236
1480120036
200-1117
2001117
232-1199
2321199
239-4909
2394909
249-0709
2490709
DCI10R-1273R
DCI10R1273R
EX631273
FS10R-1273
FS10R1273
LDFC0518
NMD10R-1273
NMD10R1273
R-10R-1273
R-10R1273
R10R1273

Engine Platforms: Caterpillar C15 ACERT
Engine Codes: BXS, MXS, NXS
Rating: 550HP
Injector Part Number: 10R1273

Not sure which ACERT you have? Send your serial number. We’ll verify it before you order.

215-237-9672 or SALES@MOMENTUMWORX.COM